1NSJ

CRYSTAL STRUCTURE OF PHOSPHORIBOSYL ANTHRANILATE ISOMERASE FROM THERMOTOGA MARITIMA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure at 2.0 A resolution of phosphoribosyl anthranilate isomerase from the hyperthermophile Thermotoga maritima: possible determinants of protein stability.

Hennig, M.Sterner, R.Kirschner, K.Jansonius, J.N.

(1997) Biochemistry 36: 6009-6016

  • DOI: 10.1021/bi962718q

  • PubMed Abstract: 
  • The structural basis of thermostability of proteins is of great scientific and biotechnological interest. Differences in the X-ray structues of orthologous proteins from hyperthermophilic and mesophilic organisms can indicate crucial stabilizing inte ...

    The structural basis of thermostability of proteins is of great scientific and biotechnological interest. Differences in the X-ray structues of orthologous proteins from hyperthermophilic and mesophilic organisms can indicate crucial stabilizing interactions. To this end the crystal structure of dimeric phosphoribosyl anthranilate isomerase from the hyperthermophile Thermotoga maritima (tPRAI) was determined using phases derived from the isomorphous replacement method and was refined at 2.0 A resolution. The comparison to the known 2.0 A structure of PRAI from Escherichia coli (ePRAI) shows that tPRAI has the complete TIM- or (beta alpha)8-barrel fold, whereas helix alpha5 in ePRAI is replaced by a loop. The subunits of tPRAI associate via the N-terminal faces of their central beta-barrels. Two long, symmetry-related loops that protrude reciprocally into cavities of the other subunit provide for multiple hydrophobic interactions. Moreover, the side chains of the N-terminal methionines and the C-terminal leucines of both subunits are immobilized in a hydrophobic cluster, and the number of salt bridges is increased in tPRAI. These features appear to be mainly responsible for the high thermostability of tPRAI. In contrast to other hyperthermostable enzymes, tPRAI at 25 degrees C is catalytically more efficient than ePRAI, mainly due to its small K(M) value for the substrate [Sterner, R., Kleemann, G. R., Szadkowski, H., Lustig, A., Hennig, M., & Kirschner, K. (1996) Protein Sci. 5, 2000-2008]. The increased number of hydrogen bonds between the phosphate ion and tPRAI compared to ePRAI could be responsible for this effect.


    Related Citations: 
    • Phosphoribosyl Anthranilate Isomerase from Thermotoga Maritima is an Extremely Stable and Active Homodimer
      Sterner, R.,Kleemann, G.R.,Szadkowski, H.,Lustig, A.,Hennig, M.,Kirschner, K.
      (1996) Protein Sci. 5: 2000


    Organizational Affiliation

    Department of Structural Biology, Biozentrum, University of Basel, Switzerland. Michael.Hennig@roche.com




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PHOSPHORIBOSYL ANTHRANILATE ISOMERASE
A
205Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099)Gene Names: trpF
EC: 5.3.1.24
Find proteins for Q56320 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099))
Go to UniProtKB:  Q56320
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download SDF File 
Download CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.192 
  • Space Group: P 61 2 2
Unit Cell:
Length (Å)Angle (°)
a = 68.400α = 90.00
b = 68.400β = 90.00
c = 185.400γ = 120.00
Software Package:
Software NamePurpose
X-PLORmodel building
CCP4data scaling
X-PLORrefinement
X-PLORphasing
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-03-12
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance